Introduce per-isolate assert scopes and API to guard JS execution.

include/v8.h

Index: include/v8.h
diff --git a/include/v8.h b/include/v8.h
index 4f5a8fd0bd855c85f3920319d4e93b7aa5fc5523..e133ded014fcf58b1f00a277c00a203ebab5972a 100644
--- a/include/v8.h
+++ b/include/v8.h
@@ -4070,6 +4070,32 @@ class V8_EXPORT Isolate {
     Scope& operator=(const Scope&);
   };
 
+
+  /**
+   * Assert that no Javascript code is invoked.
+   */
+  class DisallowJavascriptExecutionScope {
+   public:
+    explicit DisallowJavascriptExecutionScope(Isolate* isolate);
+    ~DisallowJavascriptExecutionScope();
+
+   private:
+    void* internal_;
+  };

[jochen (gone - plz use gerrit), 2014/03/19 11:13:16]

can you add copy and assign declarations? (like in line 4068 above..)

+
+
+  /**
+   * Introduce exception to DisallowJavascriptExecutionScope.
+   */
+  class AllowJavascriptExecutionScope {
+   public:
+    explicit AllowJavascriptExecutionScope(Isolate* isolate);
+    ~AllowJavascriptExecutionScope();
+
+   private:
+    void* internal_;
+  };
+
   /**
    * Types of garbage collections that can be requested via
    * RequestGarbageCollectionForTesting.